Basic number theory (Die Grundlehren der mathematischen Wissenschaften in Einzeldarstellungen)

From the reviews: "L.R. Shafarevich showed me the first edition […] and said that this book will be from now on the book about class field theory. In fact it is by far the most complete treatment of the main theorems of algebraic number theory, including function fields over finite constant fields, that appeared in book form." Zentralblatt MATH